酸性气田产水气井产能计算方法

Calculation Method of Water Production Gas Well Productivity for Sour Gas Field

普光气田主体为带边底水的酸性气藏,在开发过程中,凝析水的析出和边底水的侵入将影响气井产能,另一方面,天然气中的酸性气体对气井产能计算有一定影响,因此,准确确定产水气井产能显得尤其重要。鉴于没有实用的方法计算酸性气田产水气井产能,在修正高含硫气体基本物性参数的基础上,从无水气井产能方程出发,利用气水相对渗透率曲线、气井产水率、生产水气比的关系,修正表皮系数,从而计算出酸性气田产水气井的产能。该方法不仅能够快速地对气井产水后的产能进行计算分析,还能够预测未来不同生产水气比时气井产能的变化。实例证明,方法能够准确评价酸性气田产水气井产能。

The Puguang gas field is sour gas reservoir with edge and bottom water,the precipitation of condensate water and the invasion of edge and bottom water will affect the productivity of gas well in the development process,on the other hand,the acid gas in natural gas have impact on gas well productivity calculation,therefore,it is especially important to determinate accurately gas well productivity of water production gas well.Because there is no practical method for the calculation of acid gas field water production gas well productivity,starting from the deliverability equation of gas well without water production,in view of the relationship between relative permeability curve,gas production rate and water-gas ratio,productivity is calculated by correction of skin coefficient,which based on the correction of high sulfur gas properties.This method can not only analyze water production gas well productivity quickly,but also can predict future productivity with different producing water-gas ratio.The example proves this method can accurately assess the sour gas field water production gas well productivity.